Bryant and Stratton College Animal Genetics & Gel Electrophoresis Lab Report Lab 9 Short Tandem Repeat (STR) Analysis Using PCR and Gel Electrophoresis     In forensic investigations, Forensic Biologists use short tandem repeat (STR) analyses to help identify individuals that had been in or around a crime scene. Like identifying double muscled (DM) cows, the analysts use 20 regions of the DNA that have repeating units to generate an allelic profile to compare to known profiles of victims and potential suspects.  Research and answer the following questions about Polymerase Chain Reaction (PCR) and gel electrophoresis as it pertains to forensic investigations in your own words. Explain what happens in each of the three fundamental stages of PCR and the temperatures at which these stages are typically held. (6 pts.)             The Taq DNA polymerase is used to add nucleotides to the template strand during…    read more